<template>
  <div>
     <!-- 面包屑导航区域 -->
        <el-breadcrumb separator="/">
          <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
          <el-breadcrumb-item>商品管理</el-breadcrumb-item>
          <el-breadcrumb-item>添加商品</el-breadcrumb-item> 
        </el-breadcrumb>

       <!-- 卡片视图区域 -->
        <el-card>
              <el-alert
                title="添加商品信息"
                type="info"
                center
                show-icon :closable="false">
              </el-alert>

            <!-- 步骤条区域 -->
              <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
              </el-steps>

              <!-- tabs栏区域 -->

              <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                      <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                      </el-form-item>

                       <el-form-item label="商品价格" prop="goods_price">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                      </el-form-item>

                       <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight" type="number"></el-input>
                      </el-form-item>

                       <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                      </el-form-item>

                      <el-form-item label="商品分类" prop="goods_cat" >
                        <el-cascader  expand-trigger="hover"
                          v-model="addForm.goods_cat"
                          :options="catelist"
                          :props="cateProps"
                          @change="handleChange"></el-cascader>
                      </el-form-item>


                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">

                     <!-- 渲染表单的item 项 -->
                     <el-form-item :label="item.attr_name" v-for="item in manyTabData" :key="item.attr_id">

                        <!-- 复选框组 -->
                          <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox> 
                          </el-checkbox-group>
                     </el-form-item>

                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                     <el-form-item :label="item.attr_name" v-for="item in onlyTabData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                      </el-form-item>

                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                     <!-- action 图片上传的地址-->
                        <el-upload  
                            :action="uploadUrl"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove" 
                            :headers="headerObj"
                            :on-success="handleSuccess"
                            list-type="picture">
                            <el-button size="small" type="primary">点击上传</el-button> 
                          </el-upload>
                    </el-tab-pane>

                    <el-tab-pane label="商品内容" name="4">
                         <quill-editor  v-model="addForm.goods_introduce" ></quill-editor>  
                          <!-- 添加商品的按钮 -->
                          <el-button type="primary" class="btnAdd" @click="add"> 添加商品</el-button>
                    </el-tab-pane>


                </el-tabs> 
              </el-form>   
        </el-card>


        <!-- 图片预览 -->
        <el-dialog
          title="图片预览"
          :visible.sync="prevVisible"
          width="50%" >
          <img :src="previewPath" alt="" srcset="" class="previewImg">
        </el-dialog>

  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data(){
    return {
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm:{
        goods_name:'',
        goods_price:0,
        goods_weight:0,
        goods_number:0,
        // 商品分类的数组
        goods_cat: [],
        // 图片的数组
        pics:[],
        goods_introduce:'',
        attrs:[]
      },
      addFormRules:{
        goods_name:[
          {required:true,message:'请输入商品名称',trigger:'blur'}
        ],
        goods_price:[
          {required:true,message:'请输入商品价格',trigger:'blur'}
        ],
        goods_weight:[
           {required:true,message:'请输入商品重量',trigger:'blur'}
        ],
        goods_number:[
           {required:true,message:'请输入商品数量',trigger:'blur'}
        ],
        goods_cat:[
           {required:true,message:'请选择商品分类',trigger:'blur'}
        ]
      },
      //商品分类列表
       catelist:[], 
       cateProps:{
         label:'cat_name',
         value:'cat_id',
         children:'children'
       },
       // 动态参数列表
       manyTabData:[],
       // 静态属性列表
       onlyTabData:[],
       // 图片上传的地址
       uploadUrl:'http://127.0.0.1:8888/api/private/v1/upload',
       // 图片上传组件的header请求对象
       headerObj:{
          Authorization: window.sessionStorage.getItem('token')
       }, 
       previewPath:"",
       prevVisible:false
    } 
  },
  created(){
    this.getCateList()
  },
  methods:{
    // 获取所有商品分类数据
    async getCateList(){
        const {data:res} = await this.$http.get('categories')

        if(res.meta.status !== 200){
          return this.$message.error('获取商品分类失败')
        } 

        this.catelist = res.data
    },
    // 级联选择器选中项
    handleChange(){
        console.log(this.addForm.goods_cat)
        if(this.addForm.goods_cat.length !== 3){
            this.addForm.goods_cat = []
        }
    },
    beforeTabLeave(activeName,oldActiveName){
      // console.log(activeName,oldActiveName)

      if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
        this.$message.error('请先选择商品分类')
        return false;
      }
    },
    async tabClicked(){
      // console.log(this.activeIndex) 
      // 动态参数面板
      if(this.activeIndex ==  '1'){
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
        if(res.meta.status !== 200){
          return this.$message.error('获取动态参数列表失败')
        } 

        res.data.forEach(item =>{
          console.log(item)
          item.attr_vals = item.attr_vals.length == 0 ? [] : item.attr_vals.split(' ')
        })

        this.manyTabData = res.data
     }else if(this.activeIndex ==  '2'){
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
        if(res.meta.status !== 200){
          return this.$message.error('获取静态属性列表失败')
        } 
       
        this.onlyTabData = res.data
        console.log(this.onlyTabData)
     }
    },
    // 处理图片预览效果
    handlePreview(file){
      console.log(file)
      this.previewPath = file.response.data.url
      this.prevVisible = true
    },
     // 处理移除图片的操作
    handleRemove(file){
        const filePath = file.response.data.tmp_path
        // 查询索引值
        const i = this.addForm.pics.findIndex(x => x.pic == filePath)
    },
    // 监听图片上传成功的 事件
    handleSuccess(response){
        // 1 拼接图片信息对象
        const picInfo = {pic:response.data.tmp_path} 
        // 2 添加到数组中
        this.addForm.pics.push(picInfo)
        // 移除图片 利用splice 
        this.addForm.pics.splice(i,1)
    },
    // 添加商品
    add(){
        this.$ref.addFormRef.validate(async valid=>{
          if(!valid){
              return this.$message.error('请填写必要的表单项')
          }
          //添加

          // lodash  cloneDeep（obj)
          const form = _.cloneDeep(this.addForm)
          form.goods_cat = form.goods_cat.join(',')

          // 处理动态参数
          this.manyTabData.forEach(item=>{
            const newInfo = {
              attr_id: item.attr_id,
              attr_value:item.attr_vals.join(' ')
            }
            this.addForm.attrs.push(newInfo)
          })

          // 处理静态属性
          this.onlyTabData.forEach(item=>{
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals
            }
             this.addForm.attrs.push(newInfo)
          })

          form.attrs = this.addForm.attrs

          // 发起商品请求 添加商品 
          // 商品的名称 必须是唯一的
          const {data:res} = await this.$http.post('goods',form)

          if(res.meta.status !== 201){
              return this.$message.error('添加商品失败')
          }

          this.$message.success('添加商品成功')
          // 跳转到列表页面
          this.$router.push('/goods')
  
        })
    }
  },
  computed:{
    cateId(){
      if(this.addForm.goods_cat.length === 3){
        return this.addForm.goods_cat[2]
      }

      return null
    }
  }
}
</script>

<style scoped>
 .el-cascader{
   width: 300px;
  }

  .el-checkbox{
    margin: 0  10px 0 0 !important;
  }


  .previewImg{
    width: 100%;
  }

  .btnAdd{
    margin-top: 15px;
  }
</style>